General Description
The Supertex LR745 is a high input voltage SMPS startup circuit. The LR745 is ideally suited for use with industry standard low voltage PWM ICs having start thresholds of 13.9 - 18.0V. It allows the PWM ICs to be operated from rectified 120 or 240VAC lines, and eliminates the use of power resistors often used for this purpose.

Features
► Accepts inputs from 35V to 450V
► Output current limiting
► For PWM ICs with start-up threshold voltage of 13.9 - 18.0V
► Very low power consumption after start-up

Applications
► Notebook and laptop computers
► Telecommunication power supplies
► Battery chargers
► Motor controllers